PostNet, a design, printing and shipping company, began as a single mailbox rental center that grew into a more than 700-location franchise that caters to small businesses. The company hopes to establish 500 domestic and 500 international locations over the next few years but is not simply focused on increasing its units. “Our goal is to increase the revenue and profitability of the centers we have. We’d like to double the average revenue of a franchise, and we’re on track to hit that,” PostNet co-founder and CEO Steve Greenbaum said.